.num{
	display: flex;
	justify-content: flex-start;
}

button{
	width: 80px;
	height: 50px;
	line-height: 30px;
	font-size: 30px;
}
.a{
	width: 80px;
	height: 50px;
	text-align: center;
	line-height: 50px;
	font-size: 30px;
	background-color: red;
}
